Characteristics of nanosecond pulse dielectric surface flashover in high pressure SF6

Surface electrical insulation performance is an important issue in pulse power devices. In order to investigate the surface flashover characteristics in an environment of high pressure SF6, a flashover experiment platform was established with nanosecond pulse voltage supply. The flashover characteri...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2018-08, Vol.25 (4), p.1387-1392
Main Authors: Chuyu Sun, Hui Zhou, Weiqing Chen, Junna Li, Linshen Xie, Haiyang Wang, Guowei Zhang, Xiaoping He
Format: Article
Language:English
Subjects:
Cameras
Discharges (electric)
Electric fields
Electric potential
Electrical insulation
Electrodes
Electronic devices
Flashover
Gas pressure
High speed cameras
Low pressure
nanosecond pulse
Nanosecond pulses
Polymethyl methacrylate
SF 6
Sulfur hexafluoride
Surface discharges
Surface flashover
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Summary:Surface electrical insulation performance is an important issue in pulse power devices. In order to investigate the surface flashover characteristics in an environment of high pressure SF6, a flashover experiment platform was established with nanosecond pulse voltage supply. The flashover characteristics of polymethylmethacrylate (PMMA) specimens with circular truncated cone shapes were subsequently determined under incremental SF 6 pressures from 0.2 to 1.0 MPa. As the angle of cone increased, the flashover voltage (FV) rose under low pressure condition, but fell at first and then rose at high pressure. The surface length and the field nonuniform factor were the main influences of FV with angle. In addition, the FV rose linearly at first and then reached its maximum when gas pressure increased, and it was easier to reach the maximum when the field nonuniform factor was higher. A high speed camera was also applied to get the photos at different period of flashover, and the luminous processes of flashover along different specimens were discussed in particle perspective.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2018.006759